[PATCH] D146564: [SLP]Find reused scalars in buildvector sequences, if any.

[Alexey Bataev via Phabricator via llvm-commits]

ABataev created this revision.
ABataev added reviewers: RKSimon, vdmitrie.
Herald added subscribers: nlopes, vporpo, hiraditya.
Herald added a project: All.
ABataev requested review of this revision.
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Herald added a project: LLVM.

Patch generalizes analysis of scalars. The main part is outlined into
lambda, which can be used to find reused inserted scalars and emit
shuffle for them instead of multiple insertelement instructions, if the
permutation is found alreadyi. I.e. some scalars are transformed by the
permutation of previously vectorized nodes, and some are inserted
directly.

Reworked part of D110978 <https://reviews.llvm.org/D110978>


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D146564

Files:
  llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
  llvm/test/Transforms/SLPVectorizer/X86/jumbled-load-multiuse.ll
  llvm/test/Transforms/SLPVectorizer/X86/matched-shuffled-entries.ll

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